Diagnostic Procedure

Fig 1: DTC P0121: TP Sensor No. 1 Circuit Performance (Steps 1-6)

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Fig 2: DTC P0121: TP Sensor No. 1 Circuit Performance (Steps 7-13)

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Fig 3: DTC P0121: TP Sensor No. 1 Circuit Performance (Steps 14-19)

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Fig 4: DTC P0121: TP Sensor No. 1 Circuit Performance (Steps 20-23)

Courtesy of GENERAL MOTORS CORP.